Basic Operation and FeaturesBasler A400k 3-11DRAFT3.5 Gain and Offset3.5.1 GainGain on A400k cameras is adjustablewithin a range from 0% to 100% where 0 %correspond to the minimum gain and100 % correspond to the maximum gain.The minimum gain is always 0 dB. At anoffset of 0 %, the maximum gain isapproximately 13 dB. The maximumachievable gain decreases as the offset isincreased. See Table 3-1.The default gain is 0%.As shown in the graphs in Figure 3-10,increasing the gain setting increases theslope of the camera’s response curve andresults in a higher camera output for agiven amount of light. Decreasing the gainsetting decreases the slope of theresponse curve and results in a lowercamera output for a given amount of light.Increasing gain also increases noise. Thesignal to noise ratio decreases as gain isincreased.3.5.1.1 Setting the GainYou can set the gain by using the Camera Configuration Tool Plus (CCT+) or by using binary writecommands from within your own application to set the camera’s control and status registers(CSRs).With the CCT+With the CCT+ (see Section 4.1), you use the Gain setting in the Gain & Offset parameter groupto set the gain.By Setting CSRsYou can set the gain by writing a value to the Raw Gain field or to the Absolute Gain field of theGain CSR (see page 4-20).Section 4.2.2 explains CSRs and the difference between using the “raw” field and the “absolute”field in a CSR. Section 4.3.1 explains using read/write commands.Offset Gain in dB @ 100% Gain0% ~ 13 dB100% ~ 8 dBTable 3-1: Max. GainFigure 3-10: Response at Various Gain Settings
